<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">

      <!-- 课程所属分类 开始 -->
      <section class="path-wrap txtOf hLh30">
        <a href="/" title class="c-999 fsize14">首页</a>
        \
        <a href="/learn" title class="c-999 fsize14">学习</a>
        \
        <span class="c-333 fsize14">课程列表</span>
      </section>
      <!-- /课程所属分类 结束 -->
      
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>

      <section class="c-sort-box">
        <!-- 课程类别显示 -->
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="javascript:void(0);" @click="searchOne('')">全部</a>
                </li>
                <li
                  v-for="(item,index) in subjectNestedList"
                  v-bind:key="index"
                  :class="{active:oneIndex==index}"
                >
                  <a
                    :title="item.title"
                    href="javascript:void(0);"
                    @click="searchOne(item.id, index)"
                  >{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14" />
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li
                  v-for="(item,index) in subSubjectList"
                  v-bind:key="index"
                  :class="{active:twoIndex==index}"
                >
                  <a
                    :title="item.title"
                    href="javascript:void(0);"
                    @click="searchTwo(item.id, index)"
                  >{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear" />
        </section>

        <!-- 排序方式显示 -->
        <div class="js-wrap">
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">
                  销量
                  <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">
                  最新
                  <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">
                  价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>

        <!-- 数据列表 开始-->
        <article v-if="data.total>0" class="comm-course-list">
          <ul id="bna" class="of">
            <li v-for="item in data.items" :key="item.id">
              <div class="cc-l-wrap">
                <section class="course-img">
                  <img
                    :src="item.cover"
                    class="img-responsive"
                    alt="听力口语"
                  />
                  <div class="cc-mask">
                    <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                  </div>
                </section>
                <h3 class="hLh30 txtOf mt10">
                  <a
                    :href="'/course/'+item.id"
                    :title="item.title"
                    class="course-title fsize18 c-333"
                  >{{ item.title }}</a>
                </h3>
                <section class="mt10 hLh20 of">
                  <span v-if="Number(item.price) === 0" class="fr jgTag bg-green">
                    <i class="c-fff fsize12 f-fA">免费</i>
                  </span>
                  <span class="fl jgAttr c-ccc f-fA">
                    <i class="c-999 f-fA">{{ item.viewCount }}人学习</i>
                    |
                    <i class="c-999 f-fA">9634评论</i>
                  </span>
                </section>
              </div>
            </li>
          </ul>
          <div class="clear" />
        </article>
        <!-- /数据列表 结束-->

        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
            >首</a>
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)"
            >&lt;</a>
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)"
            >{{ page }}</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)"
            >&gt;</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)"
            >末</a>
            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>


<script>
import course from "@/api/course";

export default {
  data() {
    return {
      page: 1,
      data: {},
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: ""
    };
  },

  //加载完渲染时
  created() {
    //获取课程列表
    this.initCourse();

    //获取分类
    this.initSubject();
  },

  methods: {
    //查询课程列表
    initCourse() {
      course.getPageList(1, 8, this.searchObj).then(response => {
        this.data = response.data.data;
      });
    },
    //查询所有一级分类
    initSubject() {
      //debugger
      course.getNestedTreeList2().then(response => {
        this.subjectNestedList = response.data.data.items;
      });
    },

    //点击一级分类，显示对应的二级分类，查询数据
    searchOne(subjectParentId, index) {
      //debugger
      this.oneIndex = index;
      this.twoIndex = -1;

      this.searchObj.subjectId = "";
      this.subSubjectList = [];

      this.searchObj.subjectParentId = subjectParentId;
      this.gotoPage(this.page);

      for (let i = 0; i < this.subjectNestedList.length; i++) {
        if (this.subjectNestedList[i].id === subjectParentId) {
          this.subSubjectList = this.subjectNestedList[i].children;
        }
      }
    },

    //点击二级分类，查询数据
    searchTwo(subjectId, index) {
      this.twoIndex = index;
      this.searchObj.subjectId = subjectId;
      this.gotoPage(this.page);
    },
    //购买量查询
    searchBuyCount() {
      this.buyCountSort = "1";
      this.gmtCreateSort = "";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page);
    },
    //更新时间查询
    searchGmtCreate() {
      debugger;
      this.buyCountSort = "";
      this.gmtCreateSort = "1";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page);
    },
    //价格查询
    searchPrice() {
      this.buyCountSort = "";
      this.gmtCreateSort = "";
      this.priceSort = "1";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page);
    },
    //分页查询
    gotoPage(page) {
      this.page = page;
      course.getPageList(page, 8, this.searchObj).then(response => {
        this.data = response.data.data;
      });
    }
  }
};
</script>


<style scoped>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}
.show {
  display: block;
}
</style>